AA 1981 then AA 1376 at Philadelphia
Tampa → Philadelphia → Pittsburgh
Timetable, Philadelphia time
16:12AA 1981 from Tampa at the gate
19:28AA 1376 to Pittsburgh leaves the gate
3 h 16 apart on the timetable
The last days
AA 1981 and AA 1376 weren’t both flown 15 min to 12 h apart in the last 21 days.
Statistics from past flights, not live flight information. Always check times and your connection with your airline, and don’t base travel or booking decisions on these numbers.